P0420 Ford - p0430

Question

both codes coming up. have replaced plugs recently. few days later p0420 p0430 are showing up on my edge evolution. 2006 f150.

Answer 1

both codes are related to the catalytic converter, if you use low octane fuel that is the number 1 cause of catalytic converters going bad in the long run. 

I would start to fill up 91 octane from Shell and use a good fuel system cleaner. and also do an intake flush. Hopefully it is not too late and the catalytic converter is not damaged.